Difference of J2EE Applications

what is the difference between J2EE applications developed using WAS and other Application server.
Is the Netweaver Web Application Server mainly used for developing J2EE Applications

Hi,
There are many Web Application server that are available in the market. Each of them try to focus on Specific Customers.
Lets take simple example SAP's NetWeaver. SAP has got its own Application Server called the WAS6.0, 6.2 and now 6.4. These type of servers are suitable to run any SAP developed applications. If we use them to run any other middleware products we might need extra plugins.
J2EE applications can be developed using WebSphere Studio, WebLogic, Jbuilder, JBoss, Netweaver Studio and many more available studios. They are all based on Eclipse- which is an Open Source IDE. Every Big firm used the common IDE and added it's own components to support thier own applications.
So J2EE applications that you develop will be the same But you have to add extra plugins in the form of Jar files.

Similar Messages

Porting j2ee application from Weblogic to Oracle 10g AS

What are the common guidelines/consideration when we port a J2EE application on Oracle Application server 10g. from WebLogic 8.1. If you have some inputs on pin points/guidelines/Architecture decisions that we might need to consider when we port a J2EE application on different J2EE application server
I got the link for app server migration but it is broken :
http://www.oracle.com/consulting/technology/appserver_migration_ds.pdf
Our application uses the following J2EE components
1. JDBC 2.0
2. JNDI
3. DAO
4. EJB
5. JMS
6. JAAS
7. JAVA Mails.
8. Servlets, JSP’s
I can think following point that needs to take care while porting
1. Its deployment configuration vis-a-vis the apps on top
2. The APIs it exposes (actually the information it allows the apps to pass in to the framework
3. The data it encapsulates (in order to be app-server agnostic; does it need to be now exposed to apps?)
Some J2EE specific areas
1. JNDI usage and exposure to apps 2. Properties files/XML files
2. Location specification 3. Resource bundle location specification
4. EJB deployment descriptors
5. Class/jar references between wars and ears
6. Jar sharing model across ears
7. Class loader differences across app-servers
8. JMS settings (queues, topics, factories, durability etc)
9. UI tags 10. Startup services
11. Managed services (JMX)
12. Security context passing
13. Clustered configurations if any and how they port across app-servers
Thanks
Santosh Maskar

This document is very old.
Take a look at the recent migration guide in the Oracle AS 10.1.3.1 documentation
http://download-uk.oracle.com/docs/cd/B31017_01/migrate.1013/b31269/toc.htm

Organise a j2ee application.

Hello,
I would like to know how to organise my j2ee project.
I have actually one ejb module, one web module, one java module.
But now I would like to add another web module.
I never worked with jdeveloper before.
I have problems to understand how to organise my project because I don't know exactly how works this ide.
For my complete application, I must create a new application?
For my differents modules, I must create a new project for each of them?
How to include dependencies between each modules.
If you have a link which explain exactly how to organise my projects, that would be very nice
Thanks for your answers.

For a J2EE application create a Application Workspace.
1. Right-click on the Applications node in the Application-Navigator and select New Application Workspace.
2. In the Create Application Workspace frame, select a application template in the Application Template select list. Nodes for the application workspace and the selected application template get added.
3. To add aditional projects for web modules right-click on the Application workspace node in the Applications-Navigator and select New Project.

Deploying J2EE application on Red Hat Linux

We have a J2EE application that has been successfully deployed and running on a Windows 2000 server, but has not been successful on Red Hat Linux.
It appears that the application has been deployed on on Linux, but when we invoke the application this is the error encountered:
javax.naming.NameNotFoundException : No object bound for java:comp/env/SecurityService where SecurityService is our EJB bean.
(1)Is there any difference in deploying an EJB application on a WIndows 2000 server and a Linux server in terms of deployment descriptors, JNDI properties etc? (2)Can anybody provide examples or links to deploying an EJB application on Linux?
Thanks in advance.

I think you're looking up the wrong JNDI names for the SecurityService bean.
So you check the location attribute of the orion-ejb-jar.xml file and pass the same value in the lookup method.

Difference between J2EE 1.3 and 1.4?

Can someone point me to the difference between the two versions?
Thanks.

The primary change for the developer is the integration of Web Services (WS-I Basic Profile).
From the J2EE 1.4 Specification (http://java.sun.com/j2ee/j2ee-1_4-fr-spec.pdf):
The primary focus of J2EE 1.4 is support for web services. The JAX-RPC and SAAJ APIs provide the basic web services interoperability support. The Web Services for J2EE specification describes the packaging and deployment requirements for J2EE applications that provide and use web services. The EJB specification was also extended to support implementing web services using stateless session beans. The JAXR API supports access to registries and repositories.
Several other APIs have been added to J2EE 1.4. The J2EE Management and J2EE Deployment APIs enable enhanced tool support for J2EE products. The JMX API supports the J2EE Management API. The J2EE Authorization Contract for Containers provides an SPI for security providers.
Many of the existing J2EE APIs have been enhanced in J2EE 1.4. J2EE 1.4 builds on J2SE 1.4. The JSP specification has been enhanced to simplify thedevelopment of web applications. The Connector API now supports integration with asynchronous messaging systems, including the ability to plug in JMS providers.
Changes in this J2EE platform specification include support for deploying class libraries independently of any application and the conversion of deployment descriptor DTDs to XML Schemas.
Other J2EE APIs have been enhanced as well. For additional details, see each of the referenced specifications.
-Alexis

Exploded / Archive J2ee Applications

What is the difference between Exploded and Archived J2ee Applications? How to deploy each of the applications?

What is the difference between Exploded and Archived J2ee Applications? How to deploy each of the applications?

J2EE applications deploying

Hi all.
I'd like to know what differences there are when I deploy a J2EE application as an application instead of deploying it as stand-alone modules, other than classes being loaded by the same class loader. I am specially interested in differences at a JNDI level, if there are differences at all.
Thanks in advance.

My pleasure.
From the nature of your original question, it sounds to me that you have a good grip on the J2EE, so, if what I am about to point out is something that you already know, then by all means please ignore it...
The J2EE defines several packaging methodolgies: EJB (.jar), web application ([b/.war[/b]) and enterprise application (.ear). Each packaging paradigm is an archive, specifically, a Java archive. The J2EE specifies the specific layout of each archive as well as the specific XML deployment descriptors which are needed. EJB's can be contained within a web application and a web application can be contained with an enterprise application. Additionally, the J2EE also specifies a client application which can be packaged into an enterprise application - again, the client application is an archive, with the XML descriptors specified by the J2EE. If I remember right, the J2EE also specifies other modules, such as plain Java classes that are to be used by the enterprise application.
From a logical namespace perspective, clients of these components see one view - they need not concern themselves with any differences in terms of acquiring references to components in the container via the JNDI. However, it should be noted that the J2EE, for EJB's, specifies not only home and remotes, but local home and remotes. Just as the "normal" home interface is bound to the JNDI, so is the local home interface; both of these must be not be bound to the same node in the JNDI namespace.
Hope this helps.

Error while running a J2EE application on Oracle10gAS

Hi,
I am receiving an error when trying to run a J2EE application on Oracle10gAS. The application runs successfully on Oracle9iAS, but throws the following exception on 10g application server:
<?xml version="1.0" encoding="UTF-8" ?>
- <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
- <SOAP-ENV:Body>
- <SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring>com.evermind.server.rmi.OrionRemoteException: Error in createInstance(): null; nested exception is: java.lang.NoClassDefFoundError</faultstring>
<faultactor>/STAR-TicketBroker-context-root/TicketBrokerWS</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Does anyone have any idea why I would be receiving this
error? We are using Session EJBs in our J2EE application. Are there any changes needed in the code in order to migrate a J2EE application from 9i to 10g ???
Please help.
Thanks,
-Prashant

Hi Somil,
I've just had this same error message, and it was because I had a bogus character in my JSP sources. I'd cut-and-pasted the text from a Word document, and it included the "registered trademark" sign (an R in a circle) as a single character. This worked in my test environment, but not in my production environment (where presumably the default encoding is different). I replaced the character with the equivalent HTML entity &reg; (ie. the five characters & r e g ; ) and it all worked.
Have a look through the offending JSPs and see whether you have any characters that might be incompatible with your default encoding (anything that isn't plain old 7-bit ASCII is potentially a problem). Change them to HTML entities and you should be fine.
Hope this helps,
Richie

SSO to J2EE application from SAP Portal

Hi
I am trying to do SSO from SAP Portal to a J2EE engine which runs on SAP Web AS.
Here are my queries
1. When I deploy a J2EE application on Web AS , I dont get any login screen. How can I make sure that if a user wants to access this J2EE application he should get a login screen and provide his login credentials first, only then would he be able to access the J2EE application.
2.When I am done with Part 1. If a user tries to access this J2EE application from the Portal (asuming the user Id's in Portal and J2EE application are same and both are in the same domain) , I should not get any login screen and should be able to view the J2EE application.
3.I want to use SAP Logon tickets generated by the Portal to enable SSO.
I have done all the necessary configurations in the J2EE server.
1. Imported the Portal's verify.der certificate.
2. Adjusted the login modules stack for the application accordingly.
Can anyone please help me out with this or throw some light.
Please help.
Thanks in advance,
Vivek
PS - Points will be definitely rewarded

Hi Vivek,
Let me give you the solution for both questions differently.
Ques 1. When I deploy a J2EE application on Web AS , I dont get any login screen. How can I make sure that if a user wants to access this J2EE application he should get a login screen and provide his login credentials first, only then would he be able to access the J2EE application.
Ans: For doing this in the code of your J2EE application you have to write a if statement which will check if the user ID is coming from the backend or not. If yes then you display that logon page else you just pass that username which is coming from backend and displ;ay the page accordingly.
Ques 2.When I am done with Part 1. If a user tries to access this J2EE application from the Portal (asuming the user Id's in Portal and J2EE application are same and both are in the same domain) , I should not get any login screen and should be able to view the J2EE application.
Ans: Yes, this is what I am explaining you. Even I had also made same kind of J2EE application in which if the user is coming from the backend then he/she will look the J2EE screen else if the username is not coming then he will se the Login screen. Exactly same as what are looking for.
3.I want to use SAP Logon tickets generated by the Portal to enable SSO.
Ans: I have used User Mapping instead of SAP Logon ticket. Well that is also the option for SSO but personally I think User Mapping is easy and better way for implementing SSO.
I dont know whether this will help you or not. Please let me know. I can definately help if you want to implement SSO using User Maping.
Regards
Pravesh
PS: Please dont forget to reward points.

SSO:Portal to J2EE Application

Hi all,
I have developed a simple java application that has user-id & password textboxes along with a submit button.(login.jsp)
this is deployed as an iView in the server.
When the submit button is clicked,it navigates 2 another JSP page(welcome.jsp) that displays the user's name if the id and passowrd matches with that present in the backend DB.
I want 2 display this welcome page directly without prompting for a logon frm the user.
How can i do this with AppIntegrator?I referd the following <a href="https://www.sdn.sap.com/irj/sdn/thread?threadID=95024">thread</a>I cant find the system uri,in the source code of the application!
How should i proceed further?
Thanks in advance.
anticipating replies
SwarnaDeepika

Hi Swarna,
Kindly try these steps..I have accumulated the points as per the discussions on mail.
Just try all these steps..
1) I hope you have created a J2EE application which has its own data source (i.e: tables in the Data Dictionary which has enteries for user and Password).
2) Create a HTTP system for usermapping.
3) After that perform all the steps as mentioned in the WebLog for the App integrator. (i.e: do the user mapping to the system by providing the User name and password.)
4) In the J2EE Application write the code that If that username which you got from the URL and the userName in your data source is same then show him the main page directly, else show him the Login Page.
5) Create a URL View in which you can put your application. Set the admin,user property from the User Management.
I hope all these will solve your problem!! Kinldy check this!!
Regards
Pravesh

Unable to connect to the OracleForms application through a J2EE application

Hi there,
I have deployed a custom J2EE application in Middleware instance of my Oracle 10g AS 10.1.2
The application is sso enabled . Once a user logs in the application he is able to see a jsp in which i display hyperlinks for him to access.
One of these hyperlinks is pointing to the forms application.
the url is http://psc-pc0592:7778/forms/frmservlet?config=abs_deploy[b]
Once i click on the URL the forms applet begins to load but as the applet opens up i get the database logon screen.This should not happen
I am already logged and have been verified by sso.
Also the forms configuration is associated with a datasource.
I am not able to get as to why i get that screen when it shoud directly connect to the forms application.
Any help on this is appreciated.
Thanks & Regards,
Madhur Pant

when you go through your carrier provider, there is an additional step in the SSL tunnel. Not sure how this transcribes, but it is possible that your carrier does not use the same port as the one you want it to use.
The search box on top-right of this page is your true friend, and the public Knowledge Base too:

J2EE application access from Portal - P4ObjectBroker

hey all,
I want to access access a J2EE application (Web Service) from a Portal Component. The documentation at http://help.sap.com/saphelp_nw04/helpdata/en/c0/a584409db95537e10000000a1550b0/content.htm shows an example.
They import the package com.sap.engine.services.rmi_p4.P4ObjectBroker. I cannot find the package on my system, i.e. my local portal installation.
Does anybody know what kind of package is required, or where I can find this package...
many thanks in advance
cheers Sascha

Hey Sascha,
the P4ObjectBroker is part of the implementation of the P4 Provider Service on the J2EE Engine. It is part of the com.sap.engine.services.rmi_p4 package.
If you can't find it I recommend you to search it using ClassLocator, it is a plugin that indexes all your packages and locates the propar class for you.
You can download it at this link: http://sourceforge.net/projects/classlocator
Read the instructions of how to use it with the NWDS, it is really simple. If you need more help do tell me.
Regards,
Roy

How to access a Portal User Info from a J2EE application?

Hi,
I have deployed a j2ee application in portal and its running fine.
from that application i need to assign some roles to some users.i have the user id.
so my doubt is can i access the portal user info from this j2ee application?i have some servlets in the j2ee application....can i get the portal user info from this servlet?
plz help me
regards,
Visweswar

Hi,
Please check out this to get the portal user information from Java -
WdClientUser class/Interface to aciehve this.
Please check out these links on the same -
WDClientUser.getClientUser IUser
help needed
Regards
Lekha

Create J2EE Application in Release 6.20

Hi All,
I'm quiet new to SAP WAS.
I read in the documentation that JAVA IDE (SAP NETWEAVER DEVELOPER STUDIO) is added start on Release 6.30 (Please, correct me if I'am wrong).
If it so, how can I create J2EE application in Release 6.20. A brief explanation will be highly appreciated.
Thanks,
Edward (Indonesia).

Hi Kalle,
Thx, I have got the CD brom the Basis guy, and sucessfully installed it on my PC.
But when I try to execute Stand Alone Server, this error occured:
Loading core services:
Starting core service monitor ... done.
Starting core service p4 ... done.
Starting core service log ... done.
Starting core service dbms ... done.
Starting core service security ... done.
System Exception * Fail to start Naming. Exception is: java.security.AccessContr
olException: access denied (com.inqmy.lib.security.DomainsEnumerationPermission
ProtectionDomainEnumeration)
java.security.AccessControlException: access denied (com.inqmy.lib.security.Doma
insEnumerationPermission ProtectionDomainEnumeration)
 at java.security.AccessControlContext.checkPermission(AccessControlConte
xt.java:269)
 at java.security.AccessController.checkPermission(AccessController.java:
401)
 at com.inqmy.core.policy.PolicyManager.getProtectionDomainStack(PolicyMa
nager.java:311)
 at com.inqmy.core.service.context.container.security.DefaultProtectionDo
mainContext.getProtectionDomainStack(DefaultProtectionDomainContext.java:99)
 at com.inqmy.services.security.domains.ProtectionDomainManagerImpl.getPr
otectionDomainStack(ProtectionDomainManagerImpl.java:96)
 at com.inqmy.services.jndi.InitialContextFactoryImpl.getInitialContext(I
nitialContextFactoryImpl.java:72)
 at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:6
62)
 at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243
 at javax.naming.InitialContext.init(InitialContext.java:219)
 at javax.naming.InitialContext.<init>(InitialContext.java:175)
 at com.inqmy.services.jndi.JNDIFrame.bindReferences(JNDIFrame.java:278)
 at com.inqmy.services.jndi.JNDIFrame.start(JNDIFrame.java:176)
 at com.inqmy.core.service.application.ApplicationServiceRunner.startFram
e(ApplicationServiceRunner.java:55)
 at com.inqmy.core.service.container.ServiceRunner.run(ServiceRunner.java
:126)
 at com.inqmy.core.thread.impl2.SingleThread.run(SingleThread.java:118)
Starting core service naming ... done.
Please Help.
Warm regard,
Edward.

Is anyone doing disaster recovery for a J2EE application?

We generally use database log shipping to maintain a standby database for our ABAP instances. We can successfully fail over our production application to our disaster recovery site with no real issues. With the J2EE instances (EP, ESS/MSS, BI, etc), we have a few concerns:
hostname cannot change, without going through a system copy procedure, so we would have to keep the hostnames in DR the same. (for example, ref: oss note 757692 - changing hostname is not supported)
fully qualified domain name - from what I understand, there are potentially issues with changing the fqdn, for example SSO certificates, BSPs, XI has issues, etc.
we can't keep both hostname and fqdn the same between DR and production, or we could never do a DR test.
Has anyone implemented disaster recovery for any SAP J2EE application that has run into these concerns and addressed them? Input would be greatly appreciated regarding how you addressed these issues, or how you architected your disaster recovery implementation.
Regards,
David Hull
The Walt Disney Company

I haven't done this personally, but I do have some experience with these issues in different HA environments.
To your first point: You can change the hostname, note 757692 tells you exactly how to do it. However like the note says, "Changing the name of a host server in a production system is not automatically supported by SAP." When it says "supported by SAP" I think it means SAP the company, not SAP's software. So I would contact SAP to see if this configuration would be covered under your service agreement. Then you have to think about whether you want to do something that isn't "officially supported" by SAP. Also I'm sure you'll need some kind of additional licensing for the DR systems as their hardware keys will de different.
To your second point: As for SSO certs (SAP Login Tickets), I think they should still work as long as the SID and client number of the issuing system remain the same. I don't think they are hostname or fqdn dependant. For BSPs I would think they would still work as long as they use relative paths rather than absolute paths. And for XI... I have no idea what kind of issues may arise, I'm not an XI guy.
Again, I haven't done what you're describing myself. This is just based on my HA experiences.
Hope this helps a little,
Glenn

Difference of J2EE Applications

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